From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
To: balbi@kernel.org, gregkh@linuxfoundation.org
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
sathyanarayanan.kuppuswamy@linux.intel.com,
stable@vger.kernel.org
Subject: [PATCH v1 1/1] usb: dwc3: Fix NULL pointer exception in dwc3_pci_remove()
Date: Wed, 17 Oct 2018 11:40:26 -0700 [thread overview]
Message-ID: <2972befa36441a5dea1de9efb1e1355f8406d7b6.1539801494.git.sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In dwc3_pci_quirks() function, gpiod lookup table is only registered for
baytrail SOC. But in dwc3_pci_remove(), we try to unregistered it
without any checks. This leads to NULL pointer de-reference exception in
gpiod_remove_lookup_table() when unloading the module for non baytrail
SOCs. This patch fixes this issue.
Fixes: 5741022cbdf3 ("usb: dwc3: pci: Add GPIO lookup table on platforms
without ACPI GPIO resources")
Cc: <stable@vger.kernel.org>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/usb/dwc3/dwc3-pci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index 1286076a8890..842795856bf4 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -283,8 +283,10 @@ static int dwc3_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
static void dwc3_pci_remove(struct pci_dev *pci)
{
struct dwc3_pci *dwc = pci_get_drvdata(pci);
+ struct pci_dev *pdev = dwc->pci;
- gpiod_remove_lookup_table(&platform_bytcr_gpios);
+ if (pdev->device == PCI_DEVICE_ID_INTEL_BYT)
+ gpiod_remove_lookup_table(&platform_bytcr_gpios);
#ifdef CONFIG_PM
cancel_work_sync(&dwc->wakeup_work);
#endif
--
2.7.4
next reply other threads:[~2018-10-17 18:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-17 18:40 Kuppuswamy Sathyanarayanan [this message]
2018-11-12 18:11 ` [PATCH v1 1/1] usb: dwc3: Fix NULL pointer exception in dwc3_pci_remove() sathyanarayanan kuppuswamy
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